supabase-community/copycat

Health v2 · maintenance only

Adoption not part of the score

1057 stars · 38 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Copycat is a TypeScript library for generating deterministic fake values, where the same input always maps to the same fake output. It uses SipHash under the hood so replacements are stateless and cannot easily be reversed to infer the original input.

Use cases

• generate deterministic fake data for database seeding
• anonymize sensitive data by replacing values with consistent fakes
• create stable test fixtures that don't change between runs
• replace faker when I need input-to-output determinism
• seed demo environments with reproducible fake emails and names

When to choose

• you need the same input to always produce the same fake value regardless of call order or environment
• you are anonymizing or masking production data while preserving referential consistency
• you want stateless fake data generation without managing PRNG seeds

When to avoid

• you need realistic locale-specific or highly varied fake data rather than deterministic mappings
• you just need a random sequence of fake values and don't care about determinism
• you need fake data in a language other than JavaScript/TypeScript

Facets

library · maturity active

data-generation serialization developer-tools testing privacy cross-platform fake-data deterministic database-seeding data-anonymization test-data data-engineering nodejs typescript

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